Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
KOPPERS INDUSTRIES INC PORTLAND TAR PLANT
7540 NW ST HELENS RD, PORTLAND, OR, 972103663
Parent company: KOPPERS INDUSTRIES INC
Carcinogen
PBT
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| All values in pounds (lbs) | ||||||
|---|---|---|---|---|---|---|
| Year | Naphthalene | Dibenzofuran | Polycyclic aromatic compounds | Anthracene | Creosote | Total (lbs) |
| 1999 | 2,543 | — | 47 | 4 | — | 2,594 |
| 1998 | 22,099 | 2,741 | 1,798 | 205 | 27 | 26,870 |
| 1997 | 1,738 | — | 25 | 51 | — | 1,814 |
▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.